By August 2008, shortly after the second The State of the Map conference was held, there were over 50,000 registered contributors; by March 2009 there were 100,000 and by the end of 2009 t here were nearly 200,000.
Note that not all registered contributors actually contribute to the map - in March 2008 approximately 10% of the registered user s were contributing to the map data each month
volunteers performed systematic ground surveys using a handheld GPS unit s and a notebook s or a voice recorder s
Collected d ata were then entered into the OpenStreetMap database from a computer
More recently the availability of aerial photography and other data sources from commercial and government sources has greatly increased the speed of this work and has allowed land-use data to be collected more accurately.
When large datasets are available a technical team will manage the conversion and import of the data.